44 INTRODUCTION. 



description of a very suitable and convenient one 

 may be useful. 



The bed is surrounded by a fine g-ravel or sand 

 walk, two and a half feet wide : on the outside 

 of the walk, oaken trunks, sixteen inches long, 

 having" central openings two inches square, are 

 sunk and firmly rammed in the ground, their 

 tops level therewith. These trunks have each a 

 capped stopper, to be put in when the frame is 

 taken away ; they remaining always in their 

 places, and serve as sockets to receive light 

 columns six feet high, turned out of three-inch- 

 square stuff, having a two-inch- square tenon to 

 fit into the trunk, and also a smaller tenon at 

 top, to pass through the eaves-plate, and also 

 receive the foot of the rafter which rests upon it. 

 The rafters meet on a ridge-board to which they 

 are fastened by a screw-bolt and nut. Besides 

 the corner columns, intermediate ones are added 

 according as the length of the bed requires. 



The canvass for the roof is in one piece, fixed 

 by its middle to the ridge-board ; the two sides 

 being moveable on rollers or otherwise, and rolled 



